Novel Evaluation System of Multi

Report
Kyoto University
Technology Summary
Novel Evaluation System of Multi-junction Tandem Solar Cell
[Inventors] Y. Kanemitsu, Institute for Chemical Research, Kyoto University
H, Akiyama, Institute for Solid State Physics, The Univ. of Tokyo
Description
Potential Applications
Researchers at Kyoto University and the
University of Tokyo have established a system
to measure properties of each sub-cell of a
multi-junction tandem solar cell.

Solar cell evaluation device

Solar cell evaluation system
For the development of multi-junction tandem
solar cells, it is crucial to measure the properties
of each sub-cell layer. However, currently
available devices largely rely on simulations or
parameter estimations to predict the properties
of each sub-cell layer, thus could not measure
the accurate values.
The innovation provides for a novel system to
measure the absolute electroluminescence of
each cell layer and evaluate them according to
its formulation (Fig. 1). This system is capable of
measuring I-V properties, the ratio of energy loss,
the ratio of carrier loss and internal luminous
efficacy, which indicates the quality of material.
Such accurate measurement results would
provide a great ease to choose desirable
material for each part of solar cells and optimize
the structure of each layer, resulting in improving
the efficacy of solar cell development.
Intellectual Properties
Appl. No.: JP20XX-XXXXXX
Applicant: Kyoto University
We are seeking a company to develop a
device/software using this novel system.
Advantages

Capable of measuring currentlyunmeasurable properties of each cell layer:

I-V properties

Energy loss ratio

Carrier loss ratio

Internal luminous efficacy*
*Represents quality of the material

Highly accurate measurement
Research Status
A software for the measurement is established,
and its efficacy is verified with the laboratory-scale
prototype device built on an open optical bench.
Additional research for system development and
further optimizations of the software is currently
ongoing.
Top
Mid Bot
15.2% 10.7% 2.8%
EM
AM0 1Sun
Solar cell 構造
Top 30.5%
TR
26.4%
TH
TH
NR
JN
Out
18.5%
6.8%
19.6%
28.7%
NR JN
Out
JN
Out
Ag
GaInP(Top)
Calibrated
photodiode
Fiber to
OSA or OMA
Tunnel-junction
+
Bot 20.7%
TH
TH
NR
NR
JN
Out
GaAs (Mid)
Tunnel-junction
Solar cell
Mid 22.4%
-
Copper block
Ge
26.4%
TR
(Bot)
Ag
TR: Transmission loss
TH: Thermal loss
JN: Loss arising from voltage
NR: Loss resulting from non-light-emitting recombination
EM: Loss resulting from radiative recombination
Fig. 1: Structure of the prototype device
Fig. 2: Measurement of internal energy balance of solar cell
Contact Information
Ryohei Fujigasaki
Licensing Associate, Kansai TLO Co,,Ltd.
Email: [email protected]
Phone: +81 (75) 353-5890
Fax: +81 (75) 353-5891

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